can´t mount sda partition in rescue-grml

by Armin1   Last Updated January 24, 2018 12:00 PM

I need to mount partitions from a UbuntuServer installation on my server. The hoster provides a "rescue-mode" via a grml-linux, after the bootup of grml, I can see (among others) the files sda, sda1-4 and sdb. As far as I know these are the two logical volumes sda and sdb plus the partitions sda1-4 from sda volume.

Every attempt to mount one of these gave:

mount: wrong fs type, bad option, bad superblock on >/dev/sda1, missing codepage or helper program, or other error

  In some cases useful info is found in syslog - try
  dmesg | tail or so.

This dmesg hint gave:

[ 5398.760152] sda: sda1 sda2 sda3 sda4
[ 7058.380018] sda: sda1 sda2 sda3 sda4
[ 7062.633883] sdb: unknown partition table
[ 7062.635707] sdb: unknown partition table
[ 7186.223827] EXT4-fs (sda1): VFS: Can't find ext4

For my understanding: The system already detected that it needs to mount it with/as a ext4 filesystem but it cannot find the information to do this. I think when I do it manually like this I do not need to do anything in the fstab file.

My next idea would be this thing from lots of forum-threads with repairing the filesystem/create the needed information with e2fsck but I am really afraid to make things even worse.

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